libmctp: Add .clang-format config

Also add a .clang-ignore covering all current source files for now
(.clang-ignore is consumed by OpenBMC CI infrastructure).

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I29f2cff3adb391edcfdd075c6ee0fa73cddf0281
diff --git a/.clang-ignore b/.clang-ignore
new file mode 100644
index 0000000..bae7f03
--- /dev/null
+++ b/.clang-ignore
@@ -0,0 +1,22 @@
+alloc.c
+astlpc.c
+container_of.h
+core.c
+libmctp-alloc.h
+libmctp-astlpc.h
+libmctp-log.h
+libmctp-serial.h
+libmctp.h
+log.c
+serial.c
+tests/test-utils.c
+tests/test-utils.h
+tests/test_astlpc.c
+tests/test_bridge.c
+tests/test_eid.c
+tests/test_seq.c
+tests/test_serial.c
+utils/mctp-astlpc-daemon.c
+utils/mctp-demux-daemon.c
+utils/mctp-in.c
+utils/mctp-pipe.c